I'd love to see it if it happened, but I suspect the writer is mistaking correlation for causation.
The thing that helped Halladay get over the hump is a sea change in his command. The ground balls are nice, but a lot of #3's have a high GB rate. It's more of a symptom that you have pitched well, than any predictor of what will happen, because it's an indicator that tends to fluctuate within a fairly wide range throughout a pitcher's career.
Halladay combines three things, all of which go into making him what he is.
A K/8 rate consistntly around 8. Very high for a starter.
A high groundball rate
One of the lowest bb/9 in the league.
It's the last one that I need to see from Buchholz before I'll say he's on a Halladay career track. He needs to drop a walk and a half per 9 innings to really combine all the tools Roy Halladay uses to be what he is.
That said, he did show very good command in the minors, so if he can settle in, gain some confidence at the big league level, and STOP NIBBLING, he has as good a chance to take that step as anyone on the team.